Hypodermic syringe and cartridge therefor



March 6, 1928.

H. s. COOK HYPODERMIC syn 1mm AND CARTRIDGE THEREFOR Original Fil d Mar h 2, 1922 [me Harv/g5 650k. 6 ,finizrwl a%wv Patented Mar. 9 p A .JUNITED STATES,

HARVEY s. cook, on

i f1,661,818 PATENTwOFFICE.

vALrAR Iso, INDIANA, AssIeNoR To ooox LAnoRAT oRIFs, me, A CORPORATION or nELAwAnE.

" mrronnmvrxc' SYBINGE Ann CARTRIDGE THEREFOR. I

- Original application flied It is to be understood that the illustrative embodiment shown inthe drawings is:

simply a preferred form of the invention;

and that in the following explanation of' that specific form, the described details of structure and organization .are merely exemplary. v

Referring to the drawings, the-cartridge shown. is of the type employing a tubulai' body 3, preferably of glass, sealed at one end b means of a recessed plug 4, and at the ot er end by a slidable plug 5,and containing' a charge of medicament to be injected hypodermically. Plu'g 4 is conveni.

ently made from highly resilient rubber and has its recess 6 arranged axially, so that its longitudinal thickness is largely reduced,"

on the liquid medicament, (whatever the thus facilitating piercing by a canula..- Plu 5 isshown as'consisting of united cork. an rubber sections, the rubber section being innermost for contact with the contained medicament. The partridge exemplifies a. package of medicament having a pierceable end and means to reduce its interior volume to expel the medicament through a canula peneo trating said pierceable end.

After filling of a cartrid e of the described type, a bubble of air is sometimes found in the cartridge. Also when piercing the cartridge with the syringe needle, if the practitioner is unskilled in the technique of using cartridge syringes, a minute bubble of the air initially containedv within the bore of the needle may enter the cartridge. While the empty cartridges are alwaysisterilized immediately before filling, and the medicament itself is invariably sterile, few practitioners wouldcare to expfsriment withtheir patients or run any ri s whatever and March, 2, 1922, Serial No. 540,628. Divided and this application flied November 25, 1925. Serial No. 71,320.

hence it is highly desirable to avoid the inection of any air along with the medicament. This the invention accomplishes by the simple and effective arrangement of the I parts hereinafter described; A

The syringe 8, constructed to receive the cartridge, has a head 9 forming an abutment for the pierceable end thereof and provided with a seat 10 for the enlargement 11 ofa double pointed hypodermic needle 12,

whose inner end ierces lug 4 when the parts are in operative position. This needle, when the cartridge is not in place, may be seated and removed laterally through syringe slot 13 Ha 1y i Fig. 1); extending longitudifrom sig t opening 14 to the extremity of the syringe, as disclosed'in the parent needle enlargement firmly in its seat during an injection, and hence prevents movement of the needle. The illustrated needle seating and securing means is, however, not essential to the present invention.

To seal theneedle, its inner end, in the referred .arrangement,-extends sufficiently ar into thecartridge-receiving chamber of the syringe so that it penetrates plug 4 and projects beyond the inner edge of said plug, thus being in position to enter the slidable lug 5 and be .sealedthereby, as shown in i'g; 2. As thebubble of air 7 always floats position of the syringe), it will not be expelled while plug 5 is moved through the tubular cartridge body but will be entrapped application. The cartridge itself holds the within the recess 6 when the slidable plug is moved by .syrin e lunger l5 against the end of the recesse p ug, thereby forming a closed, bubble-entrapping chamber. Even if the needle is not long enough to be sealed by plug 5, any bubble of air will almost invariably be trapped within the recess 6. If

the air bubble is so large that art of it is likely to be ejected alon'g wit the medicament, the cartridge containin it will be rejected by the manufacturers 'mspector' as unfit for use. Thus danger of injecting air into a patents body is minimized. While the syringe has beendescribed as a hypodermlc syringe,obv1ously it is useful for intraosseous, intravenous and other injectionsa syringe cartridgefor sealed medicament package comprising a tube having sealing plugs or stoppers in its opposite ends, one to be pierced by a needle and the other to be forced inward to eject the fluid, said pierceable stopper being a recessed rubber plug of substantially the same kind, form and arrangement as the recessed pierceable plug herein shown and described, is the subjectmatter of and broadly and specifically claimed in my pending application filed July 1, 1921, Serial No. 481,997. A syringe comprising or embodying such a cartridge or a cartridge characterized by such a pierceable recessed stopper, with means associated therewith to provide an injection-administering organization, including a removably mounted needle to pierce such recessed pierceable stopper, is subject-matter disclosed in said application Ser. No. 481,997 and in my pending application Serial No. 11,707 filed February 26, 1925 as a continuation of an application filed by me April 8, 1921, Serial No. 451,680%, which syringe or subject-matter is broadly and s ecifically claimed in my said application erial No. 11,707, the claims therefor being transferably to said application Serial No. 481,997. Therefore such a. cartridge and syringe embodying the same are not claimed herein broadly or otherwise than in connection with specific characteristics of the present invention as'recited in the appended claims.

Moreover, a syringe embodying a cartridge-holder having a detachable rear head to (permit endwise insertion of the cartridge, an having a laterally-slotted front end construction substantially as herein shown and described, with a. needle of the kind herein shown and described seated in said front end and held seated by the cartrid e, is the subject-matter of and claimed broa ly and specifically in my pending application filed ugust 5, 1922, Serial No. 579,924, in which application the said features are claimed per se and in various combinations and sub-combinations, for which reason no claim for such subject-matter or features is made herein except in connection with specific features of the present invention as recitedin the appended claims.

Obviously the invention is not limited to the illustrative embodiment herein disclosed. 4

What isclaimed is:

1. A h odermic syringe comprising, in combination, a syringe body having a needle seat at one end; a double ended needle havmg an enlargement intermediate its ends, said enlargement fitting the seat; a medicament cartridge fitting within the syringe body and having one end thereof sealed by a resilient recessed plug the other end being closed by a resilient, slidable plug; the inner end of the needle penetrating the recessed plug and projecting beyond said plug so as to enter and be sealed b the slidable plug when the latter reaches t 1e end of its travel through the cartridge.

2. A hypodermic syringe comprising, in combination, a syringe body; a double ended needle having an enlargement; said body providing a seat at one end for the needle enlargement; a cartridge for containing medicament inserted in the syringe body and having a recessed plug sealing one end and a slidable plug closing its other end; a plunger connected to the syringe b'ody and arranged to engage the slidable plu and push the same through the cartridge; t e inner end of the needle piercing the recessed plug and projecting beyond the same so as to be sealed by the slidable plug as the latter reaches the end of its travel through the cartridge.

3. A hypodermic syrin e comprising, in combination, a syringe bo a double ended hypodermic needle; a medicament containing cartridge received within the syringe body, said cartridge being tubular and sealed at its ends by resilient plugs, one of which is axially recessed and the other of which is designed to be moved through the cartridge; the syringe body and needle being made so that' the inner end of the positioned needle always extends the proper distance into the syringe body to pass entirely through the recessed plu and to be sealed by the movable plug as it approaches the recessed plug.

4. A medicament dis ensing cartridge comprising a tubular bo y; a resilient, recessed plug closing one end of said body; and a second resilient plug designed to seal the body at the opposite end and to slide therethrough as in the e ulsion of the medicament; said second p ug having its inner end substantially plane and unbroken so that when pushed against the recessed plug, it forms therewith a closed chamber within which a bubble of air may be trapped.

5. A hypodermic syringe comprising, in combination, a cartrid e-holding body; a medicament cartridge tfierein comprising a tube having in its fore end a sealing plug of resilient material with an inwardly opening axial recess, and having in its opposite end .a piston plug of resilient material; a cartridge-piercing canula held in operative relation to said cartridge by said body, said canula penetrating said recessed sealing plug and projecting inwardly beyond the inner end of said plug;-a plunger connected with the body adapted to enter said cartridge tube and push the piston plug through the cartridge tube; the construction arrangement being such that when the piston plug is forced home the inner end of the canula enters and is sealed by the piston lug while the plugs cooperate to provide a ubbleentrapping chamber.

6. A syringe cartridge comprising a sealed medicamentcontainer embodying a straight bored tube of glass or the like having stoppers of resilient material in its opposite ends, one of which is substantially cup-shaped with its cavity facing inward, and the other of which is substantially solid or unrecessed, so that in operation a canula may be inserted through and beyond the inner end of the recessed plug while the other plug may be forced through the tube against the re- 10 cessed plug so. as to seal the inner end of the canula and cooperate with the recessed plug to entrap an air bubble.

In testimony whereof, I have signed my name to this specification.

' HARVEY S. COOK. 

